Abscisic Acid: Emergence of a Core Signaling Network

Regulatory mechanism of abscisic acid signaling

Abscisic acid (ABA) is a major phytohormone that mediates the adaptation of plants to environmental stresses such as drought and regulates developmental signals such as seed maturation. Studies on ABA signaling have progressed rapidly since the recent discovery of PYR/PYL receptor proteins as soluble ABA receptors. In plant cells, the receptor receives ABA to inhibit the phosphatase activity of...

Abscisic acid signaling in seeds and seedlings.

Hydrogen sulfide: a new node in the abscisic acid-dependent guard cell signaling network?

Hydrogen sulfide (H2S) is fast emerging as a new gaseous signaling molecule in organisms as diverse as bacteria, fungi, worms, humans, and plants (Kabil et al., 2014). Although H2S has long been known to be toxic at high concentrations because of its ability to inhibit the mitochondrial cytochrome C oxidase, at much lower concentrations it has been proposed to act as a signal transmitter in con...

Evolution of Abscisic Acid Synthesis and Signaling Mechanisms

The plant hormone abscisic acid (ABA) mediates seed dormancy, controls seedling development and triggers tolerance to abiotic stresses, including drought. Core ABA signaling components consist of a recently identified group of ABA receptor proteins of the PYRABACTIN RESISTANCE (PYR)/REGULATORY COMPONENT OF ABA RECEPTOR (RCAR) family that act as negative regulators of members of the PROTEIN PHOS...

Omics Approaches Toward Defining the Comprehensive Abscisic Acid Signaling Network in Plants.

ABA is a plant hormone that plays crucial roles in controlling cellular and physiological responses to osmotic stress and in developmental processes. Endogenous ABA levels are increased in response to a decrease in water availability in cells, and ABA sensing and signaling are thought to be mediated according to the current model established in Arabidopsis thaliana, which involves pyrabactin re...